爆炸荷载作用下柔性支承钢筋混凝土梁动力响应分析  

Analysis of the Dynamic Responses of Reinforced Concrete Beams with Flexible Supports Subjected to Blasting Loads

作　　者：王林林[1] 宋春明[1] 邹洋[1] 王昊[1] 

机构地区：[1]解放军理工大学国防工程学院,江苏南京210007

出　　处：《国防交通工程与技术》2015年第2期32-35,共4页Traffic Engineering and Technology for National Defence

摘　　要：钢筋混凝土结构在爆炸荷载下的承载能力可以通过设置柔性支承提高。理想的刚性支承在实际结构中很难实现,通常都是柔性支承。通过在梁两端设置弹簧和阻尼器,建立了柔性支承条件下的钢筋混凝土梁的数值计算模型。运用LS-DYNA有限元分析程序对所建立的柔性支承梁有限元模型进行了计算。研究表明:与理想刚性支承相比,柔性支承对钢筋混凝土梁的变形有很大阻碍作用。梁的变形随着弹性支承刚度的减小而减小,并且结构的振动周期会随之增大。梁的挠度随着阻尼支承系数的增大而减小。因此,设置合理的弹性支承和阻尼支承可以提高钢筋混凝土结构的抗力。The anti-explosion capacity of reinforced concrete beams could be increased effectively by providing them with some special flexible supports.In practical engineering,beam structures do not use the ideal rigid supports.Instead,they usually adopt flexible supports.Established in the present paper is a numerical calculation beam model with flexible supports by means of providing springs and dampers at both ends of a beam.The established finite element beam model is calculated and analyzed with the finite element analysis program of the LS-DYNA.The research shows that,compared with the rigid support the flexible support has a greater preventive impact on the deformation of the beam.The deformation of a beam decreases with the decrease of the rigidity of the flexible support,and the vibration period of the structure will increase accordingly.The deflection of a beam decreases with the increase of the damping support coefficient.Therefore,the rational provision of flexible supports and damping supports for a reinforced concrete structure can improve the resistance of it.

关 键 词：爆炸荷载 钢筋混凝土梁 数值分析 LS-DYNA 

分 类 号：TU375.1[建筑科学—结构工程]